Prediction Markets in the UK, Reviewed Without the Hype
The Forecast Verdict covers event-contract and forecasting platforms from a UK reader's point of view. We focus on what actually matters here: whether a platform accepts British users, how the UK's gambling rules apply, what it costs, and whether the operator is trustworthy. No affiliate link ever buys a better score.
| Platform | Accepts UK users? | UK legal status | How it settles | Our verdict |
|---|---|---|---|---|
| Polymarket | No — geoblocked | Unlicensed for UK; blocked | USDC on Polygon | Read-only research value |
| Kalshi | No — US residents only | CFTC-regulated (US) | USD, regulated exchange | Strong model, not for UK |
| Smarkets | Yes | UKGC-licensed exchange | GBP, FSCS-adjacent rules | Most relevant UK option |
| Betfair Exchange | Yes | UKGC-licensed exchange | GBP | Mature, higher commission |
| Metaculus | Yes (no real money) | Not gambling — reputation only | Points, no cash | Best for pure forecasting |
| PolyGram | Check current status | Verify licensing before use | Varies by region | Owner-linked — see disclosure |
How we rate platforms
Every platform is scored on four published criteria: UK access (can a British user actually open and fund an account?), legal standing (licence, regulator, geoblocking), cost (commission, spread, deposit and withdrawal friction) and credibility (resolution track record, transparency, complaints). We weight UK access first, because a brilliant platform you cannot legally use is useless to a reader in London or Leeds.
What "prediction market" means here
A prediction market lets people trade contracts on the outcome of real-world events — an election, an interest-rate decision, a sporting result. The live price acts as a crowd-sourced probability. We frame this as forecasting and event-contract trading, not "betting", but UK readers should know the regulator does not draw that distinction.
The UK reality check
The Gambling Commission (UKGC) treats trading on the outcome of an event as gambling. Several well-known prediction markets are not UK-licensed and geoblock British IP addresses as a result. We tell you which platforms genuinely accept UK users and which are research-only — and we never explain how to bypass a block.
FAQ
Can I use prediction markets legally in the UK?
Yes, if the operator holds a UK Gambling Commission licence — UKGC-licensed betting exchanges such as Smarkets and Betfair are lawful for UK residents. Unlicensed offshore markets that geoblock the UK are not available to you here.
Why are some prediction markets blocked in the UK?
Platforms without a UKGC licence often block UK traffic rather than risk operating unlawfully. Polymarket, for example, geoblocks UK users for this reason.
Are prediction-market winnings taxed in the UK?
Gambling winnings are generally not subject to UK income tax or CGT for individuals. Activity treated as a trade or carried out through other instruments can be different, so check current HMRC guidance or a qualified adviser for your situation.
Is this site independent?
We are operated by the team behind PolyGram, which we disclose openly because PolyGram may appear in comparisons. Our rankings follow published criteria and we do not place PolyGram first by default.